Hello,
I'd be very handy to have the ability to easily duplicate a module if one wants to, for instance, create a 2nd version of a module with an alternative panel (or colour) without having to recreate the module from scratch and fill in all the details again.
The handiest will be to add a duplicate button on the module edit page to instantly create a new instance of the module that is all pre-filled and one only have to change, say, the picture.